Mechanism for adjusting cross-slides for taper attachments.



B. M. W. HANSON.

APPLIOATION FILED 001213, 1906.

Patented Aug. 23, 1910.

R y W W 5 5% 2 5 2 4 y ,2 3 J, 42 q MECHANISM FOR ADJUSTING (moss sumsr01: TA-PER ATTACHMENTS.

' (Qz'fnessee:

. UNITED STATES PATENT OFFICE.

BENGT M. W. HANSON, OF HARTFORD, CONNECTICUT, ASSIGNOR TO PRATT &WHITNEY COMPANY, OF HARTFORD,' CONNECTICUT, A CORPORATION OF NEW JERSEY.

MECHANISM FOR ADJUSTING CROSS-SLIDES FOR TAPER ATTACHMENTS.

To all whom it may concern:

Be it known that I, BENGT M. W. HAN- soN, a citizen of Sweden, havingdeclared my intention of becoming a citizen of the United States,residing at Hartford, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inMechanism for Adjusting CrossSlides for Taper Attachments, of which thefollowing is a specification.

This invention relates to turning lathes, and more especially to thatclass thereof, in which the tool is supported on a compound rest, and ithas for one of its objects the provision of an improved mechanism fortemporarily retracting the tool from the work, as for instance, duringthe return travel of the carriage or slide-rest when a screw is beingcut, and without disturbing any adjustment which may exist between theslide-rest and the tool-slide.

My invention has, furthermore, for its object the combination, with sucha mechanism, of a device which may be attached to the lathe-bed in amanner similar to, and for the same purpose, as what is ordinarily knownas a taper attachment, so that the tool-retracting mechanism may be usedwith equal facility on either straight or tapered work.

In the accompanying drawings, in which similar characters denote similarparts, Figure 1 is a perspective view of a portion of a lathe equippedwith my improved device. Fig. 2 is a central vertical section thereof,and Fig. 3 is a longitudinal section of the tool-retracting mechanism online 3, of

. Fig. 2.

It may be stated at this time, that the mechanism for adjusting thetool-carrying slide relatively to and on, the cross-slide of the lathe,may be of any well-known or suitable construction, such mechanism beingefiective merely for feeding the tool forward so as to take a deepercut, and the drawings, therefore, do not show the feeding mechanism, butare confined to the retracting mechanism, only, the numeral 10 denotingthe bed of the lathe having the usual main slide-rest 11 movable thereonlongitudinally of the bed. Mounted on the slide rest 11, is across-slide 12 which supports the tool-carrying slide 13, with itstool-post Specificatioh of Letters Patent.

Application filed October 13, 1906.

Patented Aug. 23, 1910.

Serial No. 338,863.

14 and the cutting tool 15. The rear face of the bed 10 is provided witha groove 16 to receive a tongue 17 of a bracket 18, somewhat similar tothe ordinary taper-attach- Inent bracket of well-known construction.Pivoted to the top surface of said bracket 18, and adapted forhorizontal movement thereon, is a device for guiding, and controllingthe position of, the cross-slide 12, this device being formed in theshape of trough 19, adapted to receive a shoe or block 20 which may besnugly fitted therein with the aid of a gib 21. (See Fig. 2). Near itscenter the block 20 is bored to receive a trunnion 22 of a yoke 23 whichis slotted at 241 to receive a two-part bearing bushing 25 surrounding awrist-pin or cam device 26 eccentrically disposed relative to the axisof its actuating-spindle 27 of which it is a part,

said slot being of sufficient length vertically to clear the bushing 25in its highest position, a top-plate 28 being provided on the yoke toclose said slot.

Referring now to Fig. 1, it will be obvious that the rear end of thecross-slide 12 is extended to form a pair of ears 30 which constitutebearings for the spindle 27 and one of which carries a screw 31 enteringan arcuate groove 32 (see Fig. 3) of said spindle, for limiting thethrow or rotation thereof to about 180 de rees, so that the total actualmovement of the slide 12 will be equal to the diametrical throw of theeccentric-wrist-pin 26. Attention is di rected to the fact that when thespindle 27 is rotated in its bearings 30, its axis is shiftedhorizontally relatively to the vertical movement line of the axis of thewrist 25, this latter movement resulting from the circumstance that theyoke 23 is normally stationary so that the cross-slide 12 will beshifted on its ways with the spindle axis 27 for an amount proportionateto the rotation of the latter. It is evident that, when the guide-plateor trough 19 is disposed in parallelism with the movement of the mainslide-rest 11, the cross-slide 12 will be maintained in its positionthereon, unless the spindle 27 is partially rotated, as for instance, bya handle 33, so that, under such conditions straight work may beoperated upon, as for instance, a screw, the toolslide being moved toretract the tool from the work, when the end of the thread is reached orwhenever it may be desired to return the slide-rest to the startingpoint.

The tool-retracting mechanism above described is equally applicable totapered work, in which case the guide-plate 19 should be positioned inparallellism with the front face of the work, on which the tool isoperative, such position being obtainable by virtue of the adjustabilityof the plate 19 on the bracket 18, by an adjustin screw, such asillustrated at 34 in threa ed engagement with an ear 35 on the bracket.The plate 19 may be secured inits adjusted position by clamp-screws 36the heads of which are movable in slots 37 provided in the plate 19 (seeFig. 1).

The member or taper 19 is adjustable as will be obvious and it may beset to be parallel with the axis of motion of the work or thelongitudinal axis of the machine bed or it may be adjusted at an angleto either of said axes. When said member 19v is parallel with said axesthe result will be straight or cylindrical work while if the same bearranged at an angle to said axes I can obtain taper work. The crossslide 12 will of course follow a path agreeing with the disposition ofsaid member 19. If the latter be in parallelism with either of said axesthe slide rest will follow a path coinciding with said axes while if thesaid member 19 be angularly adjusted the slide rest will take an angularpath corresponding to the disposition of said part 19.

Many changes may be made in the particular construction, and also in theorganization of some of the cooperating elements without departing fromthe spirit of the invention; and while the preferred form of the blockor shoe 20 is that shown and described, it should be understood that aroller may be substituted in lieu thereof, this latter constructionbeing especially adapted for irregular Work.

Having thus described my invention, what I claim is:

The combination of a cross slide, an angularly adjustable taper bar, ashoe to engage said taper bar and to be guided thereby, a slotted memberpivotally connected with said shoe, the cross slide having an opening toreceive said slotted member, a bushing in the slot of said slottedmember, and an oscillatory spindle supported by the cross slide andhaving an eccentric portion fitted in said bushing.

In testimony whereof I'afiix my signature in presence of two witnesses.

BENGT M. W. HANSON.

Witnesses:

JOEL W. JOHNSON, SoLoN E. DAVIS.

